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As X. Vasicola Pv. Arecae Comb ORE Open Research Exeter TITLE Transfer of Xanthomonas campestris pv. arecae and X. campestris pv. musacearum to X. vasicola (Vauterin) as X. vasicola pv. arecae comb. nov. and X. vasicola pv. musacearum comb. nov. and Description of X. vasicola pv. vasculorum pv. nov. AUTHORS Studholme, DJ; Wicker, E; Abrare, SM; et al. JOURNAL Phytopathology DEPOSITED IN ORE 24 January 2020 This version available at http://hdl.handle.net/10871/40555 COPYRIGHT AND REUSE Open Research Exeter makes this work available in accordance with publisher policies. A NOTE ON VERSIONS The version presented here may differ from the published version. If citing, you are advised to consult the published version for pagination, volume/issue and date of publication Phytopathology • XXXX • XXX:X-X • https://doi.org/10.1094/PHYTO-03-19-0098-LE Letters to the Editor Transfer of Xanthomonas campestris pv. arecae and X. campestris pv. musacearum to X. vasicola (Vauterin) as X. vasicola pv. arecae comb. nov. and X. vasicola pv. musacearum comb. nov. and Description of X. vasicola pv. vasculorum pv. nov. David J. Studholme,1,† Emmanuel Wicker,2 Sadik Muzemil Abrare,3 Andrew Aspin,4 Adam Bogdanove,5 Kirk Broders,6 Zoe Dubrow,5 Murray Grant,7 Jeffrey B. Jones,8 Georgina Karamura,9 Jillian Lang,10 Jan Leach,10 George Mahuku,11 Gloria Valentine Nakato,12 Teresa Coutinho,13 Julian Smith,4 and Carolee T. Bull14 1 Biosciences, University of Exeter, Exeter, U.K. 2 IPME, University of Montpellier, CIRAD, IRD, Montpellier, France 3 Southern Agricultural Research Institute (SARI), Areka Agricultural Research Center, Areka, Ethiopia 4 Fera Science Ltd., York, U.K. 5 Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, 334 Plant Science Building, Ithaca, NY 14853, U.S.A. 6 Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, U.S.A. 7 School of Life Sciences, Gibbet Hill, University of Warwick, Coventry, CV4 7AL, U.K. 8 University of Florida, Plant Pathology Department, 1453 Fifield Hall, Gainesville, FL 32611, U.S.A. 9 Bioversity International, Uganda 10 Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, U.S.A. 11 International Institute of Tropical Agiculture (IITA), East Africa Hub, IITA-Tanzania, P.O. Box 34441, Dar es Salaam, Tanzania 12 International Institute of Tropical Agriculture (IITA), Plot 15B, Naguru East Road, Upper Naguru, P.O. Box 7878, Kampala, Uganda 13 Department of Microbiology and Plant Pathology, Centre for Microbial Ecology and Genomics (CMEG), Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Private Bag X28, Pretoria 0028, South Africa 14 Department of Plant Pathology and Environmental Microbiology, Penn State University, University Park, PA, U.S.A. Accepted for publication 5 July 2019. ABSTRACT We present an amended description of the bacterial species Xantho- share more than 98% average nucleotide with each other and with the type monas vasicola to include the causative agent of banana Xanthomonas strain. Our analyses and proposals should help to resolve the taxonomic wilt, as well as strains that cause disease on Areca palm, Tripsacum grass, confusion that surrounds some of these pathogens and help to prevent sugarcane, and maize. Genome-sequence data reveal that these strains all future use of invalid names. The aim of this letter is to resolve the taxonomy of several There is confusion surrounding the taxonomy of some of these bacterial lineages that phylogenetically fall within the species lineages, not least around the previous splitting of Xanthomonas Xanthomonas vasicola Vauterin et al. 1995. These lineages include campestris pv. vasculorum into two new taxa: X. axonopodis pv. an economically important pathogen of banana and enset (X. vasculorum and [X. vasicola pv. vasculorum] (Vauterin et al. 1995). campestris pv. musacearum Yirgou and Bradbury 1968), a pathogen The latter name currently has no standing in the nomenclature, yet of Areca palm (X. campestris pv. arecae Rao and Mohan 1970) and has nevertheless been widely adopted. Our first objective is to closely related bacteria isolated from Tripsacum grass. Also within formally transfer these lineages into the species X. vasicola.A scope is a subset of X. campestris pv. vasculorum (Cobb 1894) Dye second objective is to formally propose X. vasicola pv. vasculorum 1978 from sugarcane and maize. Finally, it includes strains from according to the International Standards for Naming Pathovars of maize assigned to a taxon with an invalid name, [X. campestris pv. Phytopathogenic Bacteria (Young et al. 2001), which hereafter we zeae]. In this manuscript, pathovar names that have no standing in call the Standards. Our description of this pathovar corresponds to nomenclature are presented with square brackets ([]) as is standard the previous proposal (Vauterin et al. 1995) but also incorporates (Bull et al. 2012). [X. campestris pv. zeae] and agrees closely with the adopted usage of this name by the community. Despite a previous proposal (Vauterin et al. 1995), the name [X. vasicola pv. vasculorum] was † Corresponding author: D. J. Studholme; [email protected] excluded from the Names of Plant Pathogenic Bacteria (Younget al. 1996) due to the lack of a pathotype with an adherent description for Funding: This work was supported by the European Cooperation in Science and Technology (COST) Action CA16107 EuroXanth. the pathovar. Therefore, the name [X. vasicola pv. vasculorum] currently has no standing in the nomenclature and needs to be *The e-Xtra logo stands for “electronic extra” and indicates that one supplementary proposed as a pv. nov. Only a subset of X. campestris pv. vasculorum figure is published online. strains fall within X. vasicola (while others fall within X. axonopodis, The author(s) declare no conflict of interest. including the pathotype strain). Therefore, the problem cannot be solved by transferring X. campestris pv. vasculorum into X. vasicola Copyright © 2019 The Author(s). This is an open access article as a comb. nov. because no name-bearing strain is being transferred distributed under the CC BY 4.0 International license. into X. vasicola. 1 Members of the genus Xanthomonas, within the gamma- and colleagues distinguish type-A strains from type-B by sodium Proteobacteria, collectively cause disease on more than 400 plant dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) species (Hayward 1993), though some members are apparently of proteins, gas chromatography of fatty acid methyl esters and nonpathogenic (Garita-Cambronero et al. 2016; Vauterin et al. DNA-DNA hybridization (Yang et al. 1993). Type-A and type-B 1996; Vicente et al. 2017) and some have been isolated from clinical strains can also be distinguished by PCR-restriction fragment samples such as skin microbiota (Seite´ et al. 2017). Historically, length polymorphism analysis (Destefano´ et al. 2003). Table 1 lists taxonomy of Xanthomonas was tied to the host of isolation (Starr examples of X. campestris pv. vasculorum (Cobb 1894) Dye 1978 1981; Wernham 1948), with the genus being split into large strains that were classified in one or more of those studies. Vauterin numbers of species, each defined by this single phenotypic feature and colleagues assigned type-A strains to X. axonopodis pv. (Dye 1962). Subsequently, most of the species were transferred vasculorum (Cobb) Vauterin, Hoste, Kersters & Swings and (i.e., “lumped”) into a single species, X. campestris, and designated assigned type-B (Vauterin et al. 1995) to [X. vasicola pv. as nomenspecies because the organisms could not be distinguished vasculorum]. The type strain of X. campestris pv. vasculorum from one another by phenotypic and physiological tests (Dye and (Cobb 1894) Dye 1978 was among those assigned to X. axonopodis Lelliott 1974; Lapage et al. 1992). As a temporary solution, and to pv. vasculorum (Cobb) Vauterin, Hoste, Kersters & Swings. help to maintain a connection with the historical and plant- The names X. vasicola and X. vasicola pv. holcicola are listed in pathological literature, these nomenspecies were designated as the Comprehensive List of Names of Plant Pathogenic Bacteria pathovars within X. campestris, each defined by host range or (Bull et al. 2010; Young et al. 1996). However, as pointed out in disease syndrome (Dye et al. 1980). More recently, DNA sequence Bergey’s Manual (Brenner and Staley 2005), the name [X. vasicola comparisons and biochemical approaches revealed that in pv. vasculorum] (Vauterin et al. 1995) was excluded from the _ X. campestris, pathovar designation does not always correlate with Names of Plant Pathogenic Bacteria 1864 1995 (Young et al. 1996) phylogeny (Parkinson et al. 2007, 2009; Rodriguez-R et al. 2012). on the grounds that it was defective in terms of the Standards (Young There have been heroic advances to improve the taxonomy of the et al. 2001). Specifically, it lacked a modern description genus as a whole (Rademaker et al. 2005; Vauterinet al. 1990, 1995, differentiating it from other pathovars (Young et al. 2004) and 2000) and of individual taxa (Constantin et al. 2016; da Gama et al. lacked designation of a pathotype strain (Young et al. 1996). This is 2018; Jones et al. 2004; Timilsina et al. 2019; Trebaol´ et al. 2000), understandable given that Vauterin and colleagues were primarily based on phenotypic, chemotaxonomic, and genotypic analyses. concerned with species-level reclassification of the genus rather But in a number of taxa there remain unresolved issues. than focusing on individual pathovars. Although the name The bacterial pathogen X. campestris pv. musacearum (Yirgou [X. vasicola pv. vasculorum] (Vauterin et al. 1995) is invalid, this and Bradbury 1968) Dye 1978 presents a major threat to cultivation name has come to be understood by the community to represent a of banana and enset crops in central and eastern Africa, where it meaningful biological grouping; that is, a set of X. campestris pv. causes banana Xanthomonas wilt (BXW) and enset Xanthomonas vasculorum strains that are biochemically and phylogenetically wilt (EXW).
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